Ecological speciation in sympatric palms: 1. Gene expression, selection and pleiotropy.
Ecological speciation in sympatric palms: 1. Gene expression, selection and pleiotropy.
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DOI：
10.1111/jeb.12895
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发表时间：
2016-08
影响因子：
2.1
通讯作者：
Savolainen V
中科院分区：
文献类型：
--
作者：
Dunning LT;Hipperson H;Baker WJ;Butlin RK;Devaux C;Hutton I;Igea J;Papadopulos AS;Quan X;Smadja CM;Turnbull CG;Savolainen V
生态物种形成需要不同的选择、生殖隔离和将两者联系起来的遗传机制。我们研究了基因表达和编码序列进化在这一过程中的作用，使用了澳大利亚Lord Howe岛两种howa棕榈树。这些棕榈树与不同的土壤类型有关，并取代了开花时间，代表了生态物种形成的理想候选者。我们从岛上收集的两个物种的多个个体和组织类型中生成了大量的RNA‐Seq数据。我们发现，不同种类间的差异表达位点以及编码序列不同的位点与已知的生态和表型差异有关，包括对盐度、干旱、pH和开花时间的响应。从这些基因座中，我们发现了潜在的“生态物种形成基因”，并通过敲除模式植物物种中的同源基因座进一步验证了它们对开花时间的影响。最后，我们提出了6个似是而非的生态物种形成位点，为多效性有助于克服基因流动过程中物种形成过程中选择与重组之间的拮抗作用的假设提供了支持。
Ecological speciation requires divergent selection, reproductive isolation and a genetic mechanism to link the two. We examined the role of gene expression and coding sequence evolution in this process using two species of Howea palms that have diverged sympatrically on Lord Howe Island, Australia. These palms are associated with distinct soil types and have displaced flowering times, representing an ideal candidate for ecological speciation. We generated large amounts of RNA‐Seq data from multiple individuals and tissue types collected on the island from each of the two species. We found that differentially expressed loci as well as those with divergent coding sequences between Howea species were associated with known ecological and phenotypic differences, including response to salinity, drought, pH and flowering time. From these loci, we identified potential ‘ecological speciation genes’ and further validate their effect on flowering time by knocking out orthologous loci in a model plant species. Finally, we put forward six plausible ecological speciation loci, providing support for the hypothesis that pleiotropy could help to overcome the antagonism between selection and recombination during speciation with gene flow.
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